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Molecular structure connected to illustrations of a flame, liver, and colored components.

Carbohydrates Aren’t Just Fuel

Carbohydrate metabolism supplies more than immediate energy, providing glucose-derived material that cells can store or use to build molecules.

Cell containing a mitochondrion and cycling particles, connected to nutrient shapes.

How Cells Keep Their Energy Supply Going

Cells repeatedly regenerate ATP as cellular work consumes the small available supply, making continuous turnover more important than stockpiling.

Food connected to fat cells, a flame symbol, and a mitochondrion.

Why Fat Burning Is Not the Same as Fat Loss

Low-carbohydrate diets can increase fat burning, but losing stored body fat still requires an energy deficit sustained over time.

Molecular shapes flowing toward a mitochondrion, with nutrient clusters alongside.

How Your Body Uses Carbs, Protein, and Fat

Macronutrients provide different metabolic options after digestion, so carbohydrate, protein, and fat do not serve interchangeable roles in the body.

Two molecular models in contrasting red and green colors.

How Oxidation and Reduction Work in Your Cells

Redox reactions pair electron loss with electron gain, allowing metabolic pathways to transfer reducing power between molecules inside cells.